Reverse Perspective Camera in TouchDesigner

ReversePerspectiveCamera.py

# Reverse Perspective projection
eps = 0.000001

def onSetupParameters(scriptOp):
	params = scriptOp.appendCustomPage('Parameters')

	params.appendFloat('Perspective', label='Perspective')
	params.appendFloat('Distance', label='Distance')
	params.appendFloat('Ratio', label='Aspect Ratio')
	params.appendFloat('Size', label='Orthographic Size')

	return

def onCook(scriptOp):
	scriptOp.clear()

	prsp = scriptOp.par.Perspective / 100
	dist = - scriptOp.par.Distance
	ratio = scriptOp.par.Ratio + eps
	size = scriptOp.par.Size + eps

	m00 = 1 / size / ratio
	m11 = 1 / size
	m22 = - eps
	m23 = prsp
	m32 = prsp
	m33 = 1.0 - dist * prsp

	scriptOp.insertRow([m00, 0,   0,   0], 0)
	scriptOp.insertRow([0, m11,   0,   0], 1)
	scriptOp.insertRow([0,   0, m22, m23], 2)
	scriptOp.insertRow([0,   0, m32, m33], 3)
	
	return